Adjustable deburring tool

ABSTRACT

An adjustable deburring tool has a cutting head and a shank. The cutting head has a projecting ridge with a recessed portion. The shank has a groove that communicates with an open ended and open sided threaded bore. The ridge is slidably located in the groove with an adjusting screw screw-threaded in the threaded adjusting bore and partially located in the recessed portion of the ridge so that rotation of the adjusting screw causes lateral movement of the cutting head thereby adjusting the cutting diameter of the deburring tool.

FIELD AND BACKGROUND OF THE INVENTION

The present invention relates to an adjustable deburring tool capable ofdeburring of bores of differing bore diameters. Deburring tools aregenerally designed to deburr a bore of a given bore diameter. In orderto deburr bores of differing bore diameters, deburring tools withappropriate diameters are required. Inevitably, each deburring toolrequires a cutting blade, or cutting insert, designed to match thediameter of the deburring tool. Therefore, the capability of deburringbores of different bore diameters requires a stock of deburring toolsand a stock of appropriates cutting blades, or inserts.

SUMMARY OF THE INVENTION

In accordance with one aspect of the present invention, there isprovided an adjustable deburring tool having a longitudinal axis ofrotation and comprising a cutting head adjustably coupled to a shank,the cutting head having an insert pocket in which a cutting insert isretained;

-   -   the cutting head having a front face and a rear face with a        ridge projecting from the rear face, the ridge having a recessed        portion;    -   the shank having a groove communicating with an open ended and        open sided threaded adjusting bore, the ridge being slidably        located in the groove with an adjusting screw screw-threaded in        the threaded adjusting bore and partially located in the        recessed portion of the ridge.

Preferably, the ridge has a dove-tail shape and the groove has acomplementary dove-tailed shape.

In accordance with the present invention, the groove and the threadedadjusting bore extend laterally to the longitudinal axis of rotation.

Preferably, the cutting head is provided with two axially extending ovalshaped through bores and the shank is provided with two correspondingaxially extending threaded securing bores that open out to a front faceof the shank.

Further preferably, the cutting head is secured to the shank by means oftwo securing screws that are located in the through bores and screwthreaded in the threaded securing bores.

Additionally, the shank may be provided with a scale to indicate therelative displacement of the cutting head.

In another aspect, the present invention is directed to an adjustabledeburring tool holder having a longitudinal axis of rotation andcomprising: a cutting head comprising an insert pocket, a front face anda rear face with a ridge projecting from the rear face, the ridge havinga recessed portion, a shank comprising a groove communicating with athreaded adjusting bore; and an adjusting screw. The cutting head isadjustably coupled to the shank with the ridge being slidably located inthe groove, and the adjusting screw is screw-threaded in the threadedadjusting bore and partially located in the recessed portion of theridge.

BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding, the invention will now be described, by wayof example only, with reference to the accompanying drawings in which:

FIG. 1 is a side view of a deburring tool in accordance with the presentinvention;

FIG. 2 is a side view of the deburring tool shown in FIG. 1 with thecutting head in an adjusted position;

FIG. 3 is an exploded perspective view of the deburring tool shown inFIG. 1;

FIG. 4 is bottom perspective view of the cutting head of the deburringtool shown in FIG. 1; and

FIG. 5 is a partially cut away top rear perspective view of thedeburring tool shown in FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

Attention is first drawn to FIGS. 1 and 2, showing a deburring tool 10in accordance with the present invention. The deburring tool 10 has alongitudinal axis of rotation A, defining a forward to rear direction,and comprises a generally cylindrical cutting head 12 adjustably coupledto a generally cylindrical shank 14. The cutting head has a cuttinginsert 16 fixed or slidably retained in an insert pocket 18. Two cuttingedges 20 (20′, 20″) are shown in the figures. A forward facing cuttingedge 20′ for deburring the front edge of a bore and a rearward facingcutting edge 20″ for deburring the rear edge of a through bore. In FIG.1, the cutting head 12 is shown in a non-adjusted position. In thenon-adjusted position, the deburring tool 10 is capable of deburring abore with a given minimum diameter determined by the distance of thecutting edges 20 from the longitudinal axis of rotation A. In FIG. 2,the cutting head 12 is shown in an adjusted position. In the adjustedposition, the deburring tool 10 is capable of deburring a bore with adiameter larger than the given minimum diameter due to the fact that thecutting head 12 is laterally displaced relative to the non-adjustedposition shown in FIG. 1, so that the cutting edges 20 are at a greaterdistance from the longitudinal axis of rotation A in FIG. 2. For theconvenience of an operator using the deburring tool 10, a scale 22giving the relative displacement of the cutting head 12 relative to thenon-adjusted position is provided.

Attention is now turned to FIGS. 3 to 5. The cutting head 12 has a frontface 24 and a rear face 26 with a laterally extending ridge 28projecting from the rear face 26. The ridge 28 has a recessed portion30. The ridge 28 has a dove-tail shape, that is, it diverges outwardlyand rearwardly. The shank 14 has at its front face 32 a laterallyextending groove 34 which has a complementary dove-tailed shape to thatof the ridge 28 which enables the ridge 28 to be inserted into it in adirection perpendicular to the longitudinal axis of rotation A. Thecutting head 12 can move laterally, perpendicular to the longitudinalaxis of rotation A, with the ridge 28 sliding in the groove 34. Thedove-tail connection between the ridge 28 and the groove 34 ensures acertain degree of stability, so that while the ridge 28 is sliding inthe groove 34 it will not fall out of the groove 34 from the front face32 of the shank 14.

The groove 34 communicates with a laterally extending open ended andopen sided threaded adjusting bore 36. Lateral adjustment of the cuttinghead 12 relative to the shank 14 is performed by means of an adjustingscrew 38. The cutting head 12 is adjustably connected to the shank 14with the ridge 28 located in the groove 34, the adjusting screw 38located partially in the recessed portion 30 of the ridge 28 andscrew-threaded in the threaded adjusting bore 36. When the adjustingscrew 38 is rotated it moves laterally in the threaded adjusting bore 36and at the same time urges the cutting head 12 laterally since it islocated partially in the recessed portion 30 of the ridge 28.

The cutting head is provided with two axially extending oval shapedthrough bores 40 and the shank 14 is provided with two correspondingaxially extending threaded securing bores 42 that open out to the frontface 32 of the shank 14. The cutting head 12 is secured to the shank 14by means of two securing screws 44 that are located in the through bores40 and screw threaded in the threaded securing bores 42. When adjustingthe lateral position of the cutting head 12, it is sufficient to loosenthe securing screws 44, they do not have to be completely removed sincethe oval shape of the through bores 40 is sufficient to ensure freelateral movement of the cutting head 12.

It will be appreciated that the adjustable deburring tool holdercomprising the cutting head 12, the shank 14 and the adjusting screw 38can be used with the same cutting insert 16 to provide a range ofdeburring diameters. This is because the mechanism described hereinabovefor lateral adjustment of the cutting head 12 enables the laterallocation of the cutting edges 20 to be adjusted over a continuous rangeof values, thereby enabling the deburring tool 10 to deburr bores over acontinuous range of diameters.

Although the present invention has been described to a certain degree ofparticularity, it should be understood that various alterations andmodifications could be made without departing from the scope of theinvention as hereinafter claimed.

1. An adjustable deburring tool having a longitudinal axis of rotationand comprising a cutting head adjustably coupled to a shank, the cuttinghead having an insert pocket in which a cutting insert is retained; thecutting head having a front face and a rear face with a ridge projectingfrom the rear face, the ridge having a recessed portion; the shankhaving a groove communicating with an open ended and open sided threadedadjusting bore, the ridge being slidably located in the groove with anadjusting screw screw-threaded in the threaded adjusting bore andpartially located in the recessed portion of the ridge.
 2. Theadjustable deburring tool of claim 1, wherein the ridge has a dove-tailshape and the groove has a complementary dove-tailed shape.
 3. Theadjustable deburring tool of claim 1, wherein the groove and thethreaded adjusting bore extend laterally to the longitudinal axis ofrotation.
 4. The adjustable deburring tool of claim 1, wherein thecutting head is provided with two axially extending oval shaped throughbores and the shank is provided with two corresponding axially extendingthreaded securing bores that open out to a front face of the shank. 5.The adjustable deburring tool of claim 4, wherein the cutting head issecured to the shank by means of two securing screws that are located inthe through bores and screw threaded in the threaded securing bores. 6.The adjustable deburring tool of claim 1, wherein the shank is providedwith a scale to indicate relative displacement of the cutting head. 7.The adjustable deburring tool of claim 1, wherein: the ridge has adove-tail shape and the groove has a complementary dove-tailed shape;the groove and the threaded adjusting bore extend laterally to thelongitudinal axis of rotation; the cutting head is provided with twoaxially extending oval shaped through bores and the shank is providedwith two corresponding axially extending threaded securing bores thatopen out to a front face of the shank; the cutting head is secured tothe shank by means of two securing screws that are located in thethrough bores and screw threaded in the threaded securing bores; and theshank is provided with a scale to indicate relative displacement of thecutting head.
 8. An adjustable deburring tool holder having alongitudinal axis of rotation and comprising: a cutting head comprisingan insert pocket, a front face and a rear face with a ridge projectingfrom the rear face, the ridge having a recessed portion; a shankcomprising a groove communicating with a threaded adjusting bore; and anadjusting screw; wherein: the cutting head is adjustably coupled to theshank with the ridge being slidably located in the groove; and theadjusting screw is screw-threaded in the threaded adjusting bore andpartially located in the recessed portion of the ridge.
 9. Theadjustable deburring tool holder of claim 8, wherein the ridge has adove-tail shape and the groove has a complementary dove-tailed shape.10. The adjustable deburring tool holder of claim 8, wherein the grooveand the threaded adjusting bore extend laterally to the longitudinalaxis of rotation.
 11. The adjustable deburring tool holder of claim 8,wherein the cutting head is provided with two axially extending ovalshaped through bores and the shank is provided with two correspondingaxially extending threaded securing bores that open out to a front faceof the shank.
 12. The adjustable deburring tool holder of claim 11,wherein the cutting head is secured to the shank by means of twosecuring screws that are located in the through bores and screw threadedin the threaded securing bores.
 13. The adjustable deburring tool holderof claim 8, wherein the shank is provided with a scale to indicaterelative displacement of the cutting head.
 14. The adjustable deburringtool holder of claim 8, wherein the threaded adjusting bore is openended and open sided.
 15. The adjustable deburring tool holder of claim8, further comprising a cutting insert retained in the insert pocket.16. The adjustable deburring tool holder of claim 8, wherein: the ridgehas a dove-tail shape and the groove has a complementary dove-tailedshape; the groove and the threaded adjusting bore extend laterally tothe longitudinal axis of rotation; the cutting head is provided with twoaxially extending oval shaped through bores and the shank is providedwith two corresponding axially extending threaded securing bores thatopen out to a front face of the shank; the cutting head is secured tothe shank by means of two securing screws that are located in thethrough bores and screw threaded in the threaded securing bores; theshank is provided with a scale to indicate relative displacement of thecutting head; the threaded adjusting bore is open ended and open sided;and a cutting insert is retained in the insert pocket.